Abstract
We report an application of composite cavity fiber laser (CCFL) for
hydrophone sensitivity enhancement. While most of the sensitivity
enhancement methods rely on amplification of acoustic signal by the coating
design, our proposed scheme exploits the inherently nonlinear phase
condition of the CCFL. A particular point of interest for CCFL hydrophone
application is the proposed partial cavity sensing scheme that, when only
one cavity is made responsive, a substantial sensitivity enhancement can be
achieved. Theoretical analysis shows that this scheme can significantly
enhance sensitivity, achieving as high as 40 dB excess to the standard
response of a bare fiber. In experiment, this scheme produced a mean
responsivity of ${-}41.1$ dB re rad Pa$^{-1}$, representing an improvement in sensitivity by 14 dB compared to
the standard response. Evidently, this CCFL sensing scheme provides an
additional means for sensitivity improvement in conjunction to the
conventional packaging technique.
© 2010 IEEE
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